Android sensor code example understanding -

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i'm new android development , have code make shake event, not understand last_x used for?

if understand correctly last_x detecting last x-axis value of when last shaking event happened. how works, when last_x = x , x event.values[0].

private float last_x;  public void onsensorchanged(sensorevent event) {     sensor mysensor = event.sensor;      if (mysensor.gettype() == sensor.type_accelerometer) {         float x = event.values[0]; //x value              if (math.abs(last_x - x) > 2) {                 mmap.addmarker(new markeroptions()                         .position(new latlng(55.654929, 12.139613))                         .icon(bitmapdescriptorfactory.defaultmarker(bitmapdescriptorfactory.hue_orange))                         .title("hey moved x axis on"));             }             last_x = x;         }     }


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